WO2021044892A1 - Engine control device for industrial vehicle - Google Patents

Engine control device for industrial vehicle Download PDF

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Publication number
WO2021044892A1
WO2021044892A1 PCT/JP2020/031909 JP2020031909W WO2021044892A1 WO 2021044892 A1 WO2021044892 A1 WO 2021044892A1 JP 2020031909 W JP2020031909 W JP 2020031909W WO 2021044892 A1 WO2021044892 A1 WO 2021044892A1
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WO
WIPO (PCT)
Prior art keywords
engine
driver
seat
control unit
detection unit
Prior art date
Application number
PCT/JP2020/031909
Other languages
French (fr)
Japanese (ja)
Inventor
多喜康博
Original Assignee
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社豊田自動織機 filed Critical 株式会社豊田自動織機
Priority to AU2020341409A priority Critical patent/AU2020341409B2/en
Priority to KR1020227007061A priority patent/KR102620667B1/en
Priority to EP20860599.8A priority patent/EP4026999A4/en
Priority to BR112022003115A priority patent/BR112022003115A2/en
Priority to US17/639,094 priority patent/US20220298981A1/en
Priority to CN202080061650.0A priority patent/CN114303008B/en
Priority to CA3152177A priority patent/CA3152177A1/en
Publication of WO2021044892A1 publication Critical patent/WO2021044892A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/02—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the driver
    • B60K28/04—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the driver responsive to presence or absence of the driver, e.g. to weight or lack thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/08—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to drivers or passengers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/062—Details, component parts
    • B62D5/063—Pump driven by vehicle engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2062—Control of propulsion units
    • E02F9/2066—Control of propulsion units of the type combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
    • F02D17/04—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling rendering engines inoperative or idling, e.g. caused by abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0822—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to action of the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
    • B60W2050/143—Alarm means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2300/00—Indexing codes relating to the type of vehicle
    • B60W2300/12—Trucks; Load vehicles
    • B60W2300/121—Fork lift trucks, Clarks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/10—Change speed gearings
    • B60W2510/1005—Transmission ratio engaged
    • B60W2510/101—Transmission neutral state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/16—Ratio selector position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0616—Position of fuel or air injector
    • B60W2710/0627—Fuel flow rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/15—Fork lift trucks, Industrial trucks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/90—Driver alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/10—Parameters used for control of starting apparatus said parameters being related to driver demands or status
    • F02N2200/106—Driver presence, e.g. detected by door lock, seat sensor or belt sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to an engine control device for an industrial vehicle.
  • the engine control device described in Patent Document 1 includes a seat switch for detecting whether or not the driver is seated in the driver's seat of the work vehicle, a key switch which is a main power switch of the work vehicle, and an ECU. There is.
  • the seat switch determines that the driver no longer exists from the driver's seat while the work vehicle is running, the ECU can stop the engine and then start the engine when the key switch is turned off by the driver. Make it a state.
  • An object of the present invention is to provide an engine control device for an industrial vehicle capable of continuously performing power steering assist even if the driver temporarily leaves the driver's seat.
  • One aspect of the present invention is an engine control device for an industrial vehicle in which a power steering actuator is operated by hydraulic oil from a hydraulic pump driven by an engine, and detects a driver's seating / alighting state with respect to the driver's seat of the industrial vehicle.
  • the neutral detection unit that detects whether the direction operating tool of the industrial vehicle is in the neutral position, and the departure / arrival detection unit, the engine starts.
  • the seating / alighting detection unit detects the driver's seating in the driver's seat.
  • the neutral detection unit detects that the direction operating tool is in the neutral position, it includes a second control unit that restarts the output of the driving force from the engine.
  • the engine control device further includes a fuel supply unit that supplies fuel to the engine, and the first control unit supplies fuel to the engine when the driver's departure from the driver's seat is detected by the departure / arrival detection unit.
  • the fuel supply unit is controlled so as to stop the fuel supply unit, and in the second control unit, the driver's seating in the driver's seat is detected by the take-off and seating detection unit, and the direction operating tool is in the neutral position by the neutral detection unit.
  • the fuel supply unit may be controlled to restart the supply of fuel to the engine. In such a configuration, the output of the driving force from the engine can be easily and surely stopped or restarted by stopping or restarting the supply of fuel to the engine by the fuel supply unit.
  • the engine control device further includes a relay arranged between the fuel supply unit and the battery, and the first control unit sends the driver to the engine when the departure / arrival detection unit detects the driver's departure from the driver's seat.
  • the fuel supply unit is controlled via a relay so as to stop the fuel supply of the engine, and the second control unit detects the driver's seating in the driver's seat by the take-off seat detection unit and the direction operation by the neutral detection unit.
  • the fuel supply unit may be controlled via a relay so as to restart the supply of fuel to the engine.
  • the first control unit may stop the output of the driving force from the engine when the departure / arrival detection unit detects that the driver has been away from the driver's seat for a specified time.
  • the output of the driving force from the engine does not stop, so that workability can be improved.
  • the second control unit issues a warning. May be good.
  • a warning is given if the direction operating tool is in a position other than neutral. .. Therefore, it is possible to notify the driver that the state in which the output of the driving force from the engine is stopped continues.
  • the power steering assist can be continuously performed.
  • FIG. 5 is a flowchart showing details of an engine stop control processing procedure executed by the engine stop control unit shown in FIG. 2.
  • FIG. 5 is a flowchart showing details of an engine restart control processing procedure executed by the engine restart control unit shown in FIG.
  • FIG. 5 is a block diagram which shows the structure of the control system of the engine control device which concerns on 2nd Embodiment of this invention.
  • FIG. 5 is a flowchart showing details of an engine restart control processing procedure executed by the engine restart control unit shown in FIG. It is a block diagram which shows the structure of the control system of the engine control device which concerns on 3rd Embodiment of this invention.
  • FIG. 1 is a schematic configuration diagram showing an industrial vehicle provided with an engine control device according to the first embodiment of the present invention.
  • the engine control device 1 of the present embodiment is mounted on an engine-type forklift 2 which is an industrial vehicle.
  • the forklift 2 is an engine 3, a transmission 5 connected to the output shaft of the engine 3 via a torque converter 4, and a pair of left and right drives connected to the transmission 5 via a speed reducer 6 and an axle shaft 7. It has a ring 8.
  • the engine 3 may be a gasoline engine or a diesel engine.
  • the engine 3 generates a driving force by burning fuel.
  • the driving force generated by the engine 3 is mechanically transmitted to the drive wheels 8 via the torque converter 4, the transmission 5, the reduction gear 6, and the axle shaft 7, and the drive wheels 8 rotate. As a result, the forklift 2 travels.
  • the forklift 2 includes a tank 9 for storing hydraulic oil, a hydraulic pump 10 for discharging the hydraulic oil stored in the tank 9, and a power steering cylinder 11 operated by the hydraulic oil discharged from the hydraulic pump 10. (Power steering actuator), lift cylinder 12, tilt cylinder 13, and control valve unit 14.
  • the hydraulic pump 10 is rotationally driven by the driving force output from the engine 3.
  • the power steering cylinder 11 is a hydraulic cylinder that assists steering of a steering wheel (not shown) (hereinafter referred to as power steering assist).
  • the lift cylinder 12 is a hydraulic cylinder that raises and lowers a pair of forks (not shown) attached to a mast (not shown).
  • the tilt cylinder 13 is a hydraulic cylinder that tilts the mast.
  • the control valve unit 14 controls the flow of hydraulic oil supplied from the hydraulic pump 10 to the power steering cylinder 11, the lift cylinder 12, and the tilt cylinder 13.
  • the forklift 2 is provided with a vehicle speed sensor 15 and a direction lever 16 (direction operating tool).
  • the vehicle speed sensor 15 is a sensor that detects the vehicle speed of the forklift 2.
  • the direction lever 16 is an operation lever that switches the transmission 5 to any of forward, reverse, and neutral states.
  • the direction lever 16 is in the neutral position, the traveling driving force output from the engine 3 by the transmission 5 is not mechanically transmitted to the drive wheels 8.
  • the direction lever 16 is in the forward position or the reverse position, the traveling driving force output from the engine 3 by the transmission 5 is mechanically transmitted to the drive wheels 8.
  • the engine control device 1 is a device that controls the engine 3.
  • the engine control device 1 includes an injector 17, a seat switch 18, a neutral switch 19, and a vehicle control controller 20.
  • the injector 17 is a fuel injection valve that injects fuel toward a combustion chamber (not shown) in the engine 3.
  • the injector 17 is attached to the cylinder head of the engine 3.
  • the injector 17 has a control solenoid 17a into which an electric signal from the vehicle control controller 20 is input (see FIG. 2).
  • the injector 17 constitutes a fuel supply unit that supplies fuel to the engine 3.
  • the seat switch 18 is a take-off / seat detection unit that detects the take-off / seat state of the driver (operator) with respect to the driver / seat 21 of the forklift 2.
  • the term "leaving" as used herein means that the driver sitting in the seat of the driver's seat 21 stands up for a short time (for example, several seconds) and leaves the seat of the driver's seat 21.
  • the neutral switch 19 is a neutral detection unit that detects whether or not the direction lever 16 is in the neutral position.
  • the vehicle control controller 20 is composed of a microcomputer having a CPU, RAM, ROM, an input / output interface, and the like.
  • the vehicle control controller 20 inputs the detection signals of the vehicle speed sensor 15, the seat switch 18, and the neutral switch 19, performs a predetermined process, and controls the injector 17.
  • FIG. 2 is a block diagram showing the configuration of the control system of the engine control device 1.
  • the vehicle control controller 20 has an engine stop control unit 22 and an engine restart control unit 23.
  • the engine stop control unit 22 controls the control solenoid 17a of the injector 17 so as to stop the injection of fuel from the injector 17. This constitutes a first control unit that stops the output of the driving force from the engine 3.
  • the engine restart control unit 23 detects that the driver is seated in the driver's seat 21 by the seat switch 18 and the neutral switch 19. When it is detected that the direction lever 16 is in the neutral position, the control solenoid 17a is controlled so as to restart the injection of fuel from the injector 17, so that the output of the driving force from the engine 3 is restarted. It constitutes a control unit.
  • FIG. 3 is a flowchart showing details of the engine stop control processing procedure executed by the engine stop control unit 22.
  • the engine stop control unit 22 first determines whether or not the direction lever 16 is in a position other than the neutral position (forward position or reverse position) based on the detection signal of the neutral switch 19 (procedure S101).
  • the engine stop control unit 22 determines that the direction lever 16 is in a position other than neutral, the driver's seat leaving state from the driver's seat 21 continues for a specified time based on the detection signal of the seat switch 18. It is determined whether or not there is (Procedure S102).
  • the specified time is, for example, about 2 seconds.
  • the engine stop control unit 22 determines that the driver has been away from the driver's seat 21 for a predetermined time, the engine stop control unit 22 controls the control solenoid 17a so as to close the injector 17 (procedure S103).
  • the injector 17 is controlled so as to stop the supply of fuel to the engine 3.
  • the engine stop control unit 22 outputs an OFF signal as a control signal to the control solenoid 17a.
  • step S101 When the engine stop control unit 22 determines in step S101 that the direction lever 16 is in the neutral position, or when it determines in step S102 that the driver has not left the driver's seat 21 for a specified time. , The control solenoid 17a is controlled so as to open the injector 17 (procedure S104). At this time, the engine stop control unit 22 outputs an ON signal as a control signal to the control solenoid 17a.
  • FIG. 4 is a flowchart showing details of the engine restart control processing procedure executed by the engine restart control unit 23.
  • the engine restart control unit 23 first determines whether or not the driver is seated in the driver's seat 21 based on the detection signal of the seat switch 18 (procedure S111). When the engine restart control unit 23 determines that the driver is seated in the driver's seat 21, the engine restart control unit 23 determines whether or not the direction lever 16 is in the neutral position based on the detection signal of the neutral switch 19 (procedure S112). ..
  • the engine restart control unit 23 determines that the direction lever 16 is in the neutral position
  • the engine restart control unit 23 controls the control solenoid 17a so as to open the injector 17 (procedure S113).
  • the engine restart control unit 23 detects that the driver is seated in the driver's seat 21 by the seat switch 18 and detects that the direction lever 16 is in the neutral position by the neutral switch 19, and then the engine.
  • the injector 17 is controlled so as to restart the supply of fuel to 3.
  • the engine stop control unit 22 outputs an ON signal as a control signal to the control solenoid 17a.
  • the engine restart control unit 23 closes the injector 17 when it is determined in step S111 that the driver is not seated in the driver's seat 21, or when it is determined in step S112 that the direction lever 16 is not in the neutral position. Controls the control solenoid 17a (procedure S114). At this time, the engine stop control unit 22 outputs an OFF signal as a control signal to the control solenoid 17a.
  • the injector 17 is released. Open the valve. Therefore, since the injection of fuel from the injector 17 into the engine 3 is restarted, the engine 3 is restarted, and the output of the driving force from the engine 3 is restarted. As a result, the forklift 2 continues to travel.
  • the output of the driving force from the engine 3 is stopped. Then, the engine 3 coasts and the rotation speed of the engine 3 gradually decreases. After that, when it is detected that the driver is seated in the driver's seat 21 and the direction lever 16 is in the neutral position, the output of the driving force from the engine 3 is restarted. Therefore, when the driver leaves the driver's seat 21, even if the output of the driving force from the engine 3 is stopped, the driver is seated in the driver's seat 21 before the rotation of the engine 3 is completely stopped. At the same time, by setting the direction lever 16 to the neutral position, the output of the driving force from the engine 3 is restarted.
  • the output of the driving force from the engine 3 can be easily and surely stopped or restarted.
  • the output of the driving force from the engine 3 is stopped. Therefore, when the driver leaves the driver's seat 21 for an extremely short time, for example, when the driver's seat 21 is re-sit on the seat or when the driver looks into the luggage loaded on the fork (described above), the engine 3 Since the output of the driving force from the engine does not stop, workability can be improved.
  • the driver's departure from the driver's seat 21 is detected. Even if this is done, the output of the driving force from the engine 3 does not stop unnecessarily.
  • FIG. 5 is a block diagram showing a configuration of a control system of the engine control device according to the second embodiment of the present invention.
  • FIG. 5 is a diagram corresponding to FIG.
  • the engine control device 1 of the present embodiment includes a warning device 30 in addition to the configuration of the first embodiment described above.
  • the warning device 30 may emit a warning sound such as a buzzer, or may display a warning with a lamp or the like.
  • vehicle control controller 20 of the engine control device 1 has an engine restart control unit 23A instead of the engine restart control unit 23 in the first embodiment described above.
  • the engine restart control unit 23A detects that the driver is seated in the driver's seat 21 by the seat switch 18 and the neutral switch 19. When it is detected that the direction lever 16 is in the neutral position, the control solenoid 17a is controlled so as to restart the injection of fuel from the injector 17.
  • the engine restart control unit 23A detects that the driver is seated in the driver's seat 21. Give a warning.
  • FIG. 6 is a flowchart showing details of the engine restart control processing procedure executed by the engine restart control unit 23A.
  • FIG. 6 is a diagram corresponding to FIG.
  • the engine restart control unit 23A sequentially executes the procedures S111 to S113 in the same manner as the engine restart control unit 23 in the first embodiment described above.
  • the engine restart control unit 23A determines in step S112 that the direction lever 16 is not in the neutral position, the engine restart control unit 23A controls the warning device 30 so as to give a warning by the warning device 30 (procedure S120).
  • the engine restart control unit 23A controls the control solenoid 17a so as to close the injector 17 when it is determined in step S111 that the driver is not seated in the driver's seat 21 or after executing step S120 (procedure). S114).
  • the driver when the driver is seated in the driver's seat 21 after the output of the driving force from the engine 3 is stopped, if the direction lever 16 is in a position other than the neutral position, a warning is issued. It will be done. Therefore, it is possible to notify the driver that the state in which the output of the driving force from the engine 3 is stopped continues. In this case, the driver can restart the output of the driving force from the engine 3 by switching the direction lever 16 to the neutral position.
  • FIG. 7 is a block diagram showing a configuration of a control system of the engine control device according to the third embodiment of the present invention.
  • FIG. 7 is a diagram corresponding to FIG.
  • the engine control device 1 of the present embodiment includes a relay 41 arranged between the control solenoid 17a of the injector 17 and the battery 40 mounted on the forklift 2.
  • a b-contact relay that opens the secondary side when a current is passed through the primary side is used.
  • the open / closed state of the relay 41 is switched according to the control signal from the vehicle control controller 20. Specifically, when an OFF signal is output from the vehicle control controller 20 to the relay 41, the relay 41 is closed and the battery 40 and the control solenoid 17a are electrically connected.
  • the ON signal is output from the vehicle control controller 20 to the relay 41, the relay 41 is opened and the continuity between the battery 40 and the control solenoid 17a is cut off.
  • the vehicle control controller 20 of the engine control device 1 has an engine stop control unit 22 and an engine restart control unit 23, as in the first embodiment described above.
  • the engine stop control unit 22 determines that the direction lever 16 is in a position other than neutral and determines that the driver has been away from the driver's seat 21 for a specified time, the engine stop control unit 22 closes the injector 17.
  • the relay 41 is controlled in this manner (see procedures S101 to S103 in FIG. 3). In other words, when the seat switch 18 detects that the driver has left the driver's seat 21, the engine stop control unit 22 sends the injector 17 via the relay 41 so as to stop the supply of fuel to the engine 3. Control.
  • the engine restart control unit 23 controls the relay 41 so as to open the injector 17 when it is determined that the driver is seated in the driver's seat 21 and the direction lever 16 is in the neutral position (FIG. 4). (See steps S111 to S113). In other words, when the seat switch 18 detects that the driver is seated in the driver's seat 21 and the neutral switch 19 detects that the direction lever 16 is in the neutral position, the engine restart control unit 23 determines that the engine 3 The injector 17 is controlled via the relay 41 so as to restart the supply of fuel to the engine.
  • an OFF signal is output from the engine restart control unit 23 to the relay 41 as a control signal. Therefore, since the relay 41 is in the closed state (state in FIG. 7), the control solenoid 17a of the injector 17 is in the ON state (energized state). As a result, the injector 17 opens, so that fuel injection from the injector 17 is restarted.
  • the relay 41 is opened and the control solenoid 17a of the injector 17 is energized, so that the injector 17 supplies fuel to the engine 3. Can be done. In this case, since the stop of the engine 3 is suppressed, the forklift 2 can be evacuated to a safe place.
  • the present invention is not limited to the above embodiment.
  • the output of the driving force from the engine 3 is stopped, but the forklift 2 is also stopped.
  • the output of the driving force from the engine 3 is stopped.
  • the injector 17 is controlled to close when it is detected that the driver has been away from the driver's seat 21 for a predetermined time.
  • the injector 17 may be controlled to be closed when the driver's departure from the driver's seat 21 is detected.
  • the injector 17 closes when it is detected that the driver has been away from the driver's seat 21 for a predetermined time while the direction lever 16 is in a position other than the neutral position.
  • the form is not particularly limited, and even when the direction lever 16 is in the neutral position, the injector 17 is closed when the driver's departure from the driver's seat 21 is detected. You may control it.
  • the output of the driving force from the engine 3 is stopped or restarted by controlling the injector 17, but the present embodiment is not particularly limited, and for example, in the engine 3, a mixture of fuel and air is used.
  • the output of the driving force from the engine 3 may be stopped or restarted by controlling the spark plug that ignites the air or controlling the throttle valve that adjusts the amount of intake air to the engine 3.
  • the engine control device 1 of the above embodiment is mounted on the forklift 2, the present invention can be applied to an industrial vehicle such as a towing tractor as long as it is provided with an actuator for power steering.
  • Engine control device Forklift (industrial vehicle) 3 Engine 10 Hydraulic pump 11 Power steering cylinder (actuator for power steering) 16 Direction lever (direction operation tool) 17 Injector (fuel supply section) 18 Seat switch (separation / seat detection unit) 19 Neutral switch (neutral detector) 21 Driver's seat 22 Engine stop control unit (1st control unit) 23,23A Engine restart control unit (second control unit) 30 Warning device 40 Battery 41 Relay

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Abstract

An engine control device (1) is provided with: a seat switch (18) for detecting the seated/non-seated state of a driver with respect to a driver's seat (21) of a forklift (2); a neutral switch (19) for detecting whether a direction lever (16) of the forklift (2) is at a neutral position; an engine stop control unit (22) that stops outputting of a driving force from an engine (3) when leaving of the driver from the driver's seat (21) is detected; and an engine restart control unit (23) that resumes outputting of the driving force from the engine (3) upon detection of seating of the driver on the driver's seat (21) as well as detection of the presence of the direction lever (16) at the neutral position, after the outputting of the driving force from the engine (3) has been stopped.

Description

産業車両のエンジン制御装置Engine control device for industrial vehicles
　本発明は、産業車両のエンジン制御装置に関する。 The present invention relates to an engine control device for an industrial vehicle.
　産業車両のエンジン制御装置としては、例えば特許文献１に記載されている技術が知られている。特許文献１に記載のエンジン制御装置は、作業用車両の運転席への運転者の着座の有無を検出するシートスイッチと、作業用車両の主電源スイッチであるキースイッチと、ＥＣＵとを備えている。ＥＣＵは、シートスイッチにより作業用車両の走行中に運転者が運転席から存在しなくなったと判定されたときは、エンジンを停止させ、その後運転者によりキースイッチがＯＦＦされると、エンジンを起動できる状態とする。 As an engine control device for an industrial vehicle, for example, the technology described in Patent Document 1 is known. The engine control device described in Patent Document 1 includes a seat switch for detecting whether or not the driver is seated in the driver's seat of the work vehicle, a key switch which is a main power switch of the work vehicle, and an ECU. There is. When the seat switch determines that the driver no longer exists from the driver's seat while the work vehicle is running, the ECU can stop the engine and then start the engine when the key switch is turned off by the driver. Make it a state.
特開２０００－３１８４８１号公報Japanese Unexamined Patent Publication No. 2000-318481
　ところで、エンジンにより駆動される油圧ポンプからの作動油によってパワーステアリング用アクチュエータを動作させることにより、パワーステアリングアシストを実施することが可能な産業車両がある。そのような産業車両では、運転者が運転席から一度離席すると、キースイッチがＯＦＦからＯＮに切り換えられるまでの間はエンジンが停止した状態となるため、パワーステアリングアシストを行うことができなくなる。 By the way, there are industrial vehicles that can perform power steering assist by operating the power steering actuator with hydraulic oil from a hydraulic pump driven by an engine. In such an industrial vehicle, once the driver leaves the driver's seat, the engine is stopped until the key switch is switched from OFF to ON, so that power steering assist cannot be performed.
　本発明の目的は、運転者が一時的に運転席から離席しても、パワーステアリングアシストを継続的に行うことができる産業車両のエンジン制御装置を提供することである。 An object of the present invention is to provide an engine control device for an industrial vehicle capable of continuously performing power steering assist even if the driver temporarily leaves the driver's seat.
　本発明の一態様は、エンジンにより駆動される油圧ポンプからの作動油によってパワーステアリング用アクチュエータが動作する産業車両のエンジン制御装置であって、産業車両の運転席に対する運転者の離着席状態を検出する離着席検出部と、産業車両のディレクション操作具がニュートラル位置にあるかどうかを検出するニュートラル検出部と、離着席検出部により運転席からの運転者の離席が検出されると、エンジンからの駆動力の出力を停止させる第１制御部と、第１制御部によりエンジンからの駆動力の出力を停止させた後、離着席検出部により運転席への運転者の着席が検出されると共にニュートラル検出部によりディレクション操作具がニュートラル位置にあることが検出されると、エンジンからの駆動力の出力を再開させる第２制御部とを備える。 One aspect of the present invention is an engine control device for an industrial vehicle in which a power steering actuator is operated by hydraulic oil from a hydraulic pump driven by an engine, and detects a driver's seating / alighting state with respect to the driver's seat of the industrial vehicle. When the driver's departure from the driver's seat is detected by the departure / arrival detection unit, the neutral detection unit that detects whether the direction operating tool of the industrial vehicle is in the neutral position, and the departure / arrival detection unit, the engine starts. After the first control unit that stops the output of the driving force and the first control unit stop the output of the driving force from the engine, the seating / alighting detection unit detects the driver's seating in the driver's seat. When the neutral detection unit detects that the direction operating tool is in the neutral position, it includes a second control unit that restarts the output of the driving force from the engine.
　このようなエンジン制御装置においては、運転席からの運転者の離席が検出されると、エンジンからの駆動力の出力が停止する。すると、エンジンが惰性で回転し、エンジンの回転速度が徐々に下がっていく。その後、運転席への運転者の着席が検出されると共にディレクション操作具がニュートラル位置にあることが検出されると、エンジンからの駆動力の出力が再開する。従って、運転者が運転席から離席することで、エンジンからの駆動力の出力が停止しても、エンジンの回転が完全に停止する前に、運転者が運転席に着席すると共にディレクション操作具をニュートラル位置にすることで、エンジンからの駆動力の出力が再開する。このため、油圧ポンプからパワーステアリング用アクチュエータへの作動油の供給が継続されることとなる。これにより、運転者が一時的に運転席から離席しても、パワーステアリングアシストを継続的に行うことができる。 In such an engine control device, when the driver's departure from the driver's seat is detected, the output of the driving force from the engine is stopped. Then, the engine rotates by inertia, and the rotation speed of the engine gradually decreases. After that, when it is detected that the driver is seated in the driver's seat and the direction operating tool is in the neutral position, the output of the driving force from the engine is restarted. Therefore, when the driver leaves the driver's seat, even if the output of the driving force from the engine stops, the driver sits in the driver's seat and the direction operating tool before the engine rotation completely stops. By setting to the neutral position, the output of the driving force from the engine is restarted. Therefore, the supply of hydraulic oil from the hydraulic pump to the power steering actuator will be continued. As a result, even if the driver temporarily leaves the driver's seat, the power steering assist can be continuously performed.
　エンジン制御装置は、エンジンに燃料を供給する燃料供給部を更に備え、第１制御部は、離着席検出部により運転席からの運転者の離席が検出されると、エンジンへの燃料の供給を停止させるように燃料供給部を制御し、第２制御部は、離着席検出部により運転席への運転者の着席が検出されると共にニュートラル検出部によりディレクション操作具がニュートラル位置にあることが検出されると、エンジンへの燃料の供給を再開させるように燃料供給部を制御してもよい。このような構成では、燃料供給部によるエンジンへの燃料の供給を停止または再開させることにより、エンジンからの駆動力の出力を容易に且つ確実に停止または再開させることができる。 The engine control device further includes a fuel supply unit that supplies fuel to the engine, and the first control unit supplies fuel to the engine when the driver's departure from the driver's seat is detected by the departure / arrival detection unit. The fuel supply unit is controlled so as to stop the fuel supply unit, and in the second control unit, the driver's seating in the driver's seat is detected by the take-off and seating detection unit, and the direction operating tool is in the neutral position by the neutral detection unit. When detected, the fuel supply unit may be controlled to restart the supply of fuel to the engine. In such a configuration, the output of the driving force from the engine can be easily and surely stopped or restarted by stopping or restarting the supply of fuel to the engine by the fuel supply unit.
　エンジン制御装置は、燃料供給部とバッテリとの間に配置されたリレーを更に備え、第１制御部は、離着席検出部により運転席からの運転者の離席が検出されると、エンジンへの燃料の供給を停止させるようにリレーを介して燃料供給部を制御し、第２制御部は、離着席検出部により運転席への運転者の着席が検出されると共にニュートラル検出部によりディレクション操作具がニュートラル位置にあることが検出されると、エンジンへの燃料の供給を再開させるようにリレーを介して燃料供給部を制御してもよい。このような構成では、電流が流れると開くリレーを使用した場合には、第１制御部及び第２制御部を構成するコントローラが故障したときでも、リレーが開状態となり、燃料供給部が通電状態となるため、燃料供給部によるエンジンへの燃料の供給を行うことが可能となる。この場合には、エンジンの停止が抑制されるため、産業車両を安全な場所へ退避走行させることができる。 The engine control device further includes a relay arranged between the fuel supply unit and the battery, and the first control unit sends the driver to the engine when the departure / arrival detection unit detects the driver's departure from the driver's seat. The fuel supply unit is controlled via a relay so as to stop the fuel supply of the engine, and the second control unit detects the driver's seating in the driver's seat by the take-off seat detection unit and the direction operation by the neutral detection unit. When it is detected that the tool is in the neutral position, the fuel supply unit may be controlled via a relay so as to restart the supply of fuel to the engine. In such a configuration, when a relay that opens when a current flows is used, the relay is in the open state and the fuel supply unit is in the energized state even when the controllers constituting the first control unit and the second control unit fail. Therefore, it is possible to supply fuel to the engine by the fuel supply unit. In this case, since the engine stop is suppressed, the industrial vehicle can be evacuated to a safe place.
　第１制御部は、離着席検出部により運転席からの運転者の離席状態が規定時間継続したことが検出されると、エンジンからの駆動力の出力を停止させてもよい。このような構成では、運転者が極めて短い時間だけ運転席から離席した場合には、エンジンからの駆動力の出力が停止しないため、作業性を向上させることができる。 The first control unit may stop the output of the driving force from the engine when the departure / arrival detection unit detects that the driver has been away from the driver's seat for a specified time. In such a configuration, when the driver leaves the driver's seat for an extremely short time, the output of the driving force from the engine does not stop, so that workability can be improved.
　第２制御部は、離着席検出部により運転席への運転者の着席が検出されると共にニュートラル検出部によりディレクション操作具がニュートラル以外の位置にあることが検出されたときは、警告を行ってもよい。このような構成では、エンジンからの駆動力の出力が停止した後、運転者が運転席に着席したときに、ディレクション操作具がニュートラル以外の位置にある場合には、警告が行われることになる。従って、エンジンからの駆動力の出力が停止した状態が継続していることを運転者に通知することができる。 When the take-off and seating detection unit detects that the driver is seated in the driver's seat and the neutral detection unit detects that the direction operating tool is in a position other than neutral, the second control unit issues a warning. May be good. In such a configuration, when the driver sits in the driver's seat after the output of the driving force from the engine is stopped, a warning is given if the direction operating tool is in a position other than neutral. .. Therefore, it is possible to notify the driver that the state in which the output of the driving force from the engine is stopped continues.
　本発明によれば、運転者が一時的に運転席から離席しても、パワーステアリングアシストを継続的に行うことができる。 According to the present invention, even if the driver temporarily leaves the driver's seat, the power steering assist can be continuously performed.
本発明の第１実施形態に係るエンジン制御装置を備えた産業車両を示す概略構成図である。It is a schematic block diagram which shows the industrial vehicle provided with the engine control device which concerns on 1st Embodiment of this invention. 図１に示されたエンジン制御装置の制御系の構成を示すブロック図である。It is a block diagram which shows the structure of the control system of the engine control apparatus shown in FIG. 図２に示されたエンジン停止制御部により実行されるエンジン停止制御処理手順の詳細を示すフローチャートである。FIG. 5 is a flowchart showing details of an engine stop control processing procedure executed by the engine stop control unit shown in FIG. 2. 図２に示されたエンジン再始動制御部により実行されるエンジン再始動制御処理手順の詳細を示すフローチャートである。FIG. 5 is a flowchart showing details of an engine restart control processing procedure executed by the engine restart control unit shown in FIG. 本発明の第２実施形態に係るエンジン制御装置の制御系の構成を示すブロック図である。It is a block diagram which shows the structure of the control system of the engine control device which concerns on 2nd Embodiment of this invention. 図５に示されたエンジン再始動制御部により実行されるエンジン再始動制御処理手順の詳細を示すフローチャートである。FIG. 5 is a flowchart showing details of an engine restart control processing procedure executed by the engine restart control unit shown in FIG. 本発明の第３実施形態に係るエンジン制御装置の制御系の構成を示すブロック図である。It is a block diagram which shows the structure of the control system of the engine control device which concerns on 3rd Embodiment of this invention.
　以下、本発明の実施形態について図面を参照して詳細に説明する。なお、図面において、同一または同等の要素には同じ符号を付し、重複する説明を省略する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.
　図１は、本発明の第１実施形態に係るエンジン制御装置を備えた産業車両を示す概略構成図である。図１において、本実施形態のエンジン制御装置１は、産業車両であるエンジン式のフォークリフト２に搭載されている。 FIG. 1 is a schematic configuration diagram showing an industrial vehicle provided with an engine control device according to the first embodiment of the present invention. In FIG. 1, the engine control device 1 of the present embodiment is mounted on an engine-type forklift 2 which is an industrial vehicle.
　フォークリフト２は、エンジン３と、このエンジン３の出力軸にトルクコンバータ４を介して連結されたトランスミッション５と、このトランスミッション５に減速機６及びアクスルシャフト７を介して連結された左右１対の駆動輪８とを備えている。 The forklift 2 is an engine 3, a transmission 5 connected to the output shaft of the engine 3 via a torque converter 4, and a pair of left and right drives connected to the transmission 5 via a speed reducer 6 and an axle shaft 7. It has a ring 8.
　エンジン３は、ガソリンエンジンでもよいし、ディーゼルエンジンでもよい。エンジン３は、燃料を燃焼させることで、駆動力を発生させる。エンジン３で発生した駆動力は、トルクコンバータ４、トランスミッション５、減速機６及びアクスルシャフト７を介して駆動輪８に機械的に伝達され、駆動輪８が回転する。これにより、フォークリフト２が走行する。 The engine 3 may be a gasoline engine or a diesel engine. The engine 3 generates a driving force by burning fuel. The driving force generated by the engine 3 is mechanically transmitted to the drive wheels 8 via the torque converter 4, the transmission 5, the reduction gear 6, and the axle shaft 7, and the drive wheels 8 rotate. As a result, the forklift 2 travels.
　また、フォークリフト２は、作動油を貯留するタンク９と、このタンク９内に貯留された作動油を吐出する油圧ポンプ１０と、この油圧ポンプ１０から吐出される作動油により動作するパワーステアリングシリンダ１１（パワーステアリング用アクチュエータ）、リフトシリンダ１２及びティルトシリンダ１３と、コントロールバルブユニット１４とを備えている。 Further, the forklift 2 includes a tank 9 for storing hydraulic oil, a hydraulic pump 10 for discharging the hydraulic oil stored in the tank 9, and a power steering cylinder 11 operated by the hydraulic oil discharged from the hydraulic pump 10. (Power steering actuator), lift cylinder 12, tilt cylinder 13, and control valve unit 14.
　油圧ポンプ１０は、エンジン３から出力された駆動力により回転駆動される。パワーステアリングシリンダ１１は、ステアリングホイール（図示せず）の操舵アシスト（以下、パワーステアリングアシストという）を行う油圧シリンダである。リフトシリンダ１２は、マスト（図示せず）に取り付けられた１対のフォーク（図示せず）を昇降させる油圧シリンダである。ティルトシリンダ１３は、マストを傾動させる油圧シリンダである。コントロールバルブユニット１４は、油圧ポンプ１０からパワーステアリングシリンダ１１、リフトシリンダ１２及びティルトシリンダ１３に供給される作動油の流れを制御する。 The hydraulic pump 10 is rotationally driven by the driving force output from the engine 3. The power steering cylinder 11 is a hydraulic cylinder that assists steering of a steering wheel (not shown) (hereinafter referred to as power steering assist). The lift cylinder 12 is a hydraulic cylinder that raises and lowers a pair of forks (not shown) attached to a mast (not shown). The tilt cylinder 13 is a hydraulic cylinder that tilts the mast. The control valve unit 14 controls the flow of hydraulic oil supplied from the hydraulic pump 10 to the power steering cylinder 11, the lift cylinder 12, and the tilt cylinder 13.
　また、フォークリフト２は、車速センサ１５と、ディレクションレバー１６（ディレクション操作具）とを備えている。車速センサ１５は、フォークリフト２の車速を検出するセンサである。 Further, the forklift 2 is provided with a vehicle speed sensor 15 and a direction lever 16 (direction operating tool). The vehicle speed sensor 15 is a sensor that detects the vehicle speed of the forklift 2.
　ディレクションレバー１６は、トランスミッション５を前進、後進及びニュートラルの何れかの状態に切換操作する操作レバーである。ディレクションレバー１６がニュートラル位置にあるときは、トランスミッション５によってエンジン３から出力された走行駆動力が駆動輪８に機械的に伝達されていない状態となる。ディレクションレバー１６が前進位置または後進位置にあるときは、トランスミッション５によってエンジン３から出力された走行駆動力が駆動輪８に機械的に伝達されている状態となる。 The direction lever 16 is an operation lever that switches the transmission 5 to any of forward, reverse, and neutral states. When the direction lever 16 is in the neutral position, the traveling driving force output from the engine 3 by the transmission 5 is not mechanically transmitted to the drive wheels 8. When the direction lever 16 is in the forward position or the reverse position, the traveling driving force output from the engine 3 by the transmission 5 is mechanically transmitted to the drive wheels 8.
　エンジン制御装置１は、エンジン３を制御する装置である。エンジン制御装置１は、インジェクタ１７と、シートスイッチ１８と、ニュートラルスイッチ１９と、車両制御コントローラ２０とを備えている。 The engine control device 1 is a device that controls the engine 3. The engine control device 1 includes an injector 17, a seat switch 18, a neutral switch 19, and a vehicle control controller 20.
　インジェクタ１７は、エンジン３内の燃焼室（図示せず）に向けて燃料を噴射させる燃料噴射弁である。インジェクタ１７は、エンジン３のシリンダヘッドに取り付けられている。インジェクタ１７は、車両制御コントローラ２０からの電気信号が入力される制御用ソレノイド１７ａを有している（図２参照）。インジェクタ１７は、エンジン３に燃料を供給する燃料供給部を構成している。 The injector 17 is a fuel injection valve that injects fuel toward a combustion chamber (not shown) in the engine 3. The injector 17 is attached to the cylinder head of the engine 3. The injector 17 has a control solenoid 17a into which an electric signal from the vehicle control controller 20 is input (see FIG. 2). The injector 17 constitutes a fuel supply unit that supplies fuel to the engine 3.
　シートスイッチ１８は、フォークリフト２の運転席２１に対する運転者（オペレータ）の離着席状態を検出する離着席検出部である。なお、ここでいう離席とは、運転席２１のシートに座っている運転者が短時間（例えば数秒）だけ立ち上がって運転席２１のシートから離れる程度のことである。ニュートラルスイッチ１９は、ディレクションレバー１６がニュートラル位置にあるかどうかを検出するニュートラル検出部である。 The seat switch 18 is a take-off / seat detection unit that detects the take-off / seat state of the driver (operator) with respect to the driver / seat 21 of the forklift 2. The term "leaving" as used herein means that the driver sitting in the seat of the driver's seat 21 stands up for a short time (for example, several seconds) and leaves the seat of the driver's seat 21. The neutral switch 19 is a neutral detection unit that detects whether or not the direction lever 16 is in the neutral position.
　車両制御コントローラ２０は、ＣＰＵ、ＲＡＭ、ＲＯＭ及び入出力インターフェース等を有するマイコンから構成されている。車両制御コントローラ２０は、車速センサ１５、シートスイッチ１８及びニュートラルスイッチ１９の検出信号を入力し、規定の処理を行い、インジェクタ１７を制御する。 The vehicle control controller 20 is composed of a microcomputer having a CPU, RAM, ROM, an input / output interface, and the like. The vehicle control controller 20 inputs the detection signals of the vehicle speed sensor 15, the seat switch 18, and the neutral switch 19, performs a predetermined process, and controls the injector 17.
　図２は、エンジン制御装置１の制御系の構成を示すブロック図である。図２において、車両制御コントローラ２０は、エンジン停止制御部２２と、エンジン再始動制御部２３とを有している。 FIG. 2 is a block diagram showing the configuration of the control system of the engine control device 1. In FIG. 2, the vehicle control controller 20 has an engine stop control unit 22 and an engine restart control unit 23.
　エンジン停止制御部２２は、シートスイッチ１８により運転席２１からの運転者の離席が検出されると、インジェクタ１７からの燃料の噴射を停止させるようにインジェクタ１７の制御用ソレノイド１７ａを制御することにより、エンジン３からの駆動力の出力を停止させる第１制御部を構成する。 When the seat switch 18 detects that the driver has left the driver's seat 21, the engine stop control unit 22 controls the control solenoid 17a of the injector 17 so as to stop the injection of fuel from the injector 17. This constitutes a first control unit that stops the output of the driving force from the engine 3.
　エンジン再始動制御部２３は、エンジン停止制御部２２によりエンジン３からの駆動力の出力を停止させた後、シートスイッチ１８により運転席２１への運転者の着席が検出されると共にニュートラルスイッチ１９によりディレクションレバー１６がニュートラル位置にあることが検出されると、インジェクタ１７からの燃料の噴射を再開させるように制御用ソレノイド１７ａを制御することにより、エンジン３からの駆動力の出力を再開させる第２制御部を構成する。 After the engine stop control unit 22 stops the output of the driving force from the engine 3, the engine restart control unit 23 detects that the driver is seated in the driver's seat 21 by the seat switch 18 and the neutral switch 19. When it is detected that the direction lever 16 is in the neutral position, the control solenoid 17a is controlled so as to restart the injection of fuel from the injector 17, so that the output of the driving force from the engine 3 is restarted. It constitutes a control unit.
　図３は、エンジン停止制御部２２により実行されるエンジン停止制御処理手順の詳細を示すフローチャートである。 FIG. 3 is a flowchart showing details of the engine stop control processing procedure executed by the engine stop control unit 22.
　図３において、エンジン停止制御部２２は、まずニュートラルスイッチ１９の検出信号に基づいて、ディレクションレバー１６がニュートラル以外の位置（前進位置または後進位置）にあるかどうかを判断する（手順Ｓ１０１）。 In FIG. 3, the engine stop control unit 22 first determines whether or not the direction lever 16 is in a position other than the neutral position (forward position or reverse position) based on the detection signal of the neutral switch 19 (procedure S101).
　エンジン停止制御部２２は、ディレクションレバー１６がニュートラル以外の位置にあると判断したときは、シートスイッチ１８の検出信号に基づいて、運転席２１からの運転者の離席状態が規定時間継続しているかどうかを判断する（手順Ｓ１０２）。規定時間は、例えば２秒程度である。 When the engine stop control unit 22 determines that the direction lever 16 is in a position other than neutral, the driver's seat leaving state from the driver's seat 21 continues for a specified time based on the detection signal of the seat switch 18. It is determined whether or not there is (Procedure S102). The specified time is, for example, about 2 seconds.
　エンジン停止制御部２２は、運転席２１からの運転者の離席状態が規定時間継続していると判断したときは、インジェクタ１７を閉じるように制御用ソレノイド１７ａを制御する（手順Ｓ１０３）。言い換えれば、エンジン停止制御部２２、シートスイッチ１８により運転席２１からの運転者の離席が検出されると、エンジン３への燃料の供給を停止させるようにインジェクタ１７を制御する。このとき、エンジン停止制御部２２から制御用ソレノイド１７ａに、制御信号としてＯＦＦ信号が出力される。 When the engine stop control unit 22 determines that the driver has been away from the driver's seat 21 for a predetermined time, the engine stop control unit 22 controls the control solenoid 17a so as to close the injector 17 (procedure S103). In other words, when the engine stop control unit 22 and the seat switch 18 detect that the driver leaves the driver's seat 21, the injector 17 is controlled so as to stop the supply of fuel to the engine 3. At this time, the engine stop control unit 22 outputs an OFF signal as a control signal to the control solenoid 17a.
　エンジン停止制御部２２は、手順Ｓ１０１でディレクションレバー１６がニュートラル位置にあると判断したとき、または手順Ｓ１０２で運転席２１からの運転者の離席状態が規定時間継続していないと判断したときは、インジェクタ１７を開くように制御用ソレノイド１７ａを制御する（手順Ｓ１０４）。このとき、エンジン停止制御部２２から制御用ソレノイド１７ａに、制御信号としてＯＮ信号が出力される。 When the engine stop control unit 22 determines in step S101 that the direction lever 16 is in the neutral position, or when it determines in step S102 that the driver has not left the driver's seat 21 for a specified time. , The control solenoid 17a is controlled so as to open the injector 17 (procedure S104). At this time, the engine stop control unit 22 outputs an ON signal as a control signal to the control solenoid 17a.
　図４は、エンジン再始動制御部２３により実行されるエンジン再始動制御処理手順の詳細を示すフローチャートである。 FIG. 4 is a flowchart showing details of the engine restart control processing procedure executed by the engine restart control unit 23.
　図４において、エンジン再始動制御部２３は、まずシートスイッチ１８の検出信号に基づいて、運転者が運転席２１に着席したかどうかを判断する（手順Ｓ１１１）。エンジン再始動制御部２３は、運転者が運転席２１に着席したと判断したときは、ニュートラルスイッチ１９の検出信号に基づいて、ディレクションレバー１６がニュートラル位置にあるかどうかを判断する（手順Ｓ１１２）。 In FIG. 4, the engine restart control unit 23 first determines whether or not the driver is seated in the driver's seat 21 based on the detection signal of the seat switch 18 (procedure S111). When the engine restart control unit 23 determines that the driver is seated in the driver's seat 21, the engine restart control unit 23 determines whether or not the direction lever 16 is in the neutral position based on the detection signal of the neutral switch 19 (procedure S112). ..
　エンジン再始動制御部２３は、ディレクションレバー１６がニュートラル位置にあると判断したときは、インジェクタ１７を開くように制御用ソレノイド１７ａを制御する（手順Ｓ１１３）。言い換えれば、エンジン再始動制御部２３は、シートスイッチ１８により運転席２１への運転者の着席が検出されると共にニュートラルスイッチ１９により、ディレクションレバー１６がニュートラル位置にあることが検出されると、エンジン３への燃料の供給を再開させるようにインジェクタ１７を制御する。このとき、エンジン停止制御部２２から制御用ソレノイド１７ａに、制御信号としてＯＮ信号が出力される。 When the engine restart control unit 23 determines that the direction lever 16 is in the neutral position, the engine restart control unit 23 controls the control solenoid 17a so as to open the injector 17 (procedure S113). In other words, the engine restart control unit 23 detects that the driver is seated in the driver's seat 21 by the seat switch 18 and detects that the direction lever 16 is in the neutral position by the neutral switch 19, and then the engine. The injector 17 is controlled so as to restart the supply of fuel to 3. At this time, the engine stop control unit 22 outputs an ON signal as a control signal to the control solenoid 17a.
　エンジン再始動制御部２３は、手順Ｓ１１１で運転者が運転席２１に着席していないと判断したとき、または手順Ｓ１１２でディレクションレバー１６がニュートラル位置にないと判断したときは、インジェクタ１７を閉じるように制御用ソレノイド１７ａを制御する（手順Ｓ１１４）。このとき、エンジン停止制御部２２から制御用ソレノイド１７ａに、制御信号としてＯＦＦ信号が出力される。 The engine restart control unit 23 closes the injector 17 when it is determined in step S111 that the driver is not seated in the driver's seat 21, or when it is determined in step S112 that the direction lever 16 is not in the neutral position. Controls the control solenoid 17a (procedure S114). At this time, the engine stop control unit 22 outputs an OFF signal as a control signal to the control solenoid 17a.
　以上において、例えばディレクションレバー１６がニュートラル以外の位置にある状態でフォークリフト２が走行している際に、運転者が規定時間連続して運転席２１から離席すると、インジェクタ１７が閉弁する。従って、インジェクタ１７からエンジン３内への燃料の噴射が停止するため、エンジン３が停止し、エンジン３からの駆動力の出力が停止する。これにより、フォークリフト２の無人走行を防止することができる。 In the above, for example, when the forklift 2 is traveling with the direction lever 16 in a position other than neutral, if the driver leaves the driver's seat 21 continuously for a specified time, the injector 17 closes. Therefore, since the injection of fuel from the injector 17 into the engine 3 is stopped, the engine 3 is stopped and the output of the driving force from the engine 3 is stopped. This makes it possible to prevent the forklift 2 from running unmanned.
　このとき、インジェクタ１７からの燃料の噴射が停止した直後は、エンジン３が惰性で回転し、エンジン３の回転速度が徐々に下がっていく。このため、フォークリフト２の走行速度が徐々に低下する。 At this time, immediately after the injection of fuel from the injector 17 is stopped, the engine 3 coasts and the rotation speed of the engine 3 gradually decreases. Therefore, the traveling speed of the forklift 2 gradually decreases.
　そして、エンジン３の回転が完全に停止する前、つまりフォークリフト２の走行が完全に停止する前に、運転者が運転席２１に着席し、ディレクションレバー１６をニュートラル位置に切換操作すると、インジェクタ１７が開弁する。従って、インジェクタ１７からエンジン３内への燃料の噴射が再開するため、エンジン３が再始動され、エンジン３からの駆動力の出力が再開する。これにより、フォークリフト２の走行が継続される。 Then, when the driver sits in the driver's seat 21 and switches the direction lever 16 to the neutral position before the rotation of the engine 3 is completely stopped, that is, before the running of the forklift 2 is completely stopped, the injector 17 is released. Open the valve. Therefore, since the injection of fuel from the injector 17 into the engine 3 is restarted, the engine 3 is restarted, and the output of the driving force from the engine 3 is restarted. As a result, the forklift 2 continues to travel.
　以上のように本実施形態にあっては、運転席２１からの運転者の離席が検出されると、エンジン３からの駆動力の出力が停止する。すると、エンジン３が惰性で回転し、エンジン３の回転速度が徐々に下がっていく。その後、運転席２１への運転者の着席が検出されると共にディレクションレバー１６がニュートラル位置にあることが検出されると、エンジン３からの駆動力の出力が再開する。従って、運転者が運転席２１から離席することで、エンジン３からの駆動力の出力が停止しても、エンジン３の回転が完全に停止する前に、運転者が運転席２１に着席すると共にディレクションレバー１６をニュートラル位置にすることで、エンジン３からの駆動力の出力が再開する。このため、油圧ポンプ１０からパワーステアリングシリンダ１１への作動油の供給が継続されることとなる。これにより、運転者が一時的に運転席２１から離席しても、パワーステアリングアシストを継続的に行うことができる。その結果、フォークリフト２の操作性を向上させることが可能となる。 As described above, in the present embodiment, when the driver's departure from the driver's seat 21 is detected, the output of the driving force from the engine 3 is stopped. Then, the engine 3 coasts and the rotation speed of the engine 3 gradually decreases. After that, when it is detected that the driver is seated in the driver's seat 21 and the direction lever 16 is in the neutral position, the output of the driving force from the engine 3 is restarted. Therefore, when the driver leaves the driver's seat 21, even if the output of the driving force from the engine 3 is stopped, the driver is seated in the driver's seat 21 before the rotation of the engine 3 is completely stopped. At the same time, by setting the direction lever 16 to the neutral position, the output of the driving force from the engine 3 is restarted. Therefore, the supply of hydraulic oil from the hydraulic pump 10 to the power steering cylinder 11 is continued. As a result, even if the driver temporarily leaves the driver's seat 21, the power steering assist can be continuously performed. As a result, the operability of the forklift 2 can be improved.
　また、本実施形態では、インジェクタ１７によるエンジン３への燃料の供給を停止または再開させることにより、エンジン３からの駆動力の出力を容易に且つ確実に停止または再開させることができる。 Further, in the present embodiment, by stopping or restarting the supply of fuel to the engine 3 by the injector 17, the output of the driving force from the engine 3 can be easily and surely stopped or restarted.
　また、本実施形態では、運転席２１への運転者の離席状態が規定時間継続したことが検出されると、エンジン３からの駆動力の出力が停止する。従って、例えば運転席２１のシートへの座り直しやフォーク（前述）に積載された荷物の覗き込み等のように、運転者が極めて短い時間だけ運転席２１から離席した場合には、エンジン３からの駆動力の出力が停止しないため、作業性を向上させることができる。 Further, in the present embodiment, when it is detected that the driver has been away from the driver's seat 21 for a specified time, the output of the driving force from the engine 3 is stopped. Therefore, when the driver leaves the driver's seat 21 for an extremely short time, for example, when the driver's seat 21 is re-sit on the seat or when the driver looks into the luggage loaded on the fork (described above), the engine 3 Since the output of the driving force from the engine does not stop, workability can be improved.
　また、本実施形態では、ディレクションレバー１６がニュートラル位置にあることで、エンジン３からの駆動力が駆動輪８に機械的に伝達されない場合には、運転席２１からの運転者の離席が検出されても、エンジン３からの駆動力の出力が不要に停止することがない。 Further, in the present embodiment, when the direction lever 16 is in the neutral position and the driving force from the engine 3 is not mechanically transmitted to the drive wheels 8, the driver's departure from the driver's seat 21 is detected. Even if this is done, the output of the driving force from the engine 3 does not stop unnecessarily.
　図５は、本発明の第２実施形態に係るエンジン制御装置の制御系の構成を示すブロック図である。図５は、図２に対応する図である。図５において、本実施形態のエンジン制御装置１は、上記の第１実施形態の構成に加え、警告器３０を備えている。警告器３０は、ブザー等の警告音を発してよいし、ランプ等で警告表示を行ってもよい。 FIG. 5 is a block diagram showing a configuration of a control system of the engine control device according to the second embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. In FIG. 5, the engine control device 1 of the present embodiment includes a warning device 30 in addition to the configuration of the first embodiment described above. The warning device 30 may emit a warning sound such as a buzzer, or may display a warning with a lamp or the like.
　また、エンジン制御装置１の車両制御コントローラ２０は、上記の第１実施形態におけるエンジン再始動制御部２３に代えて、エンジン再始動制御部２３Ａを有している。 Further, the vehicle control controller 20 of the engine control device 1 has an engine restart control unit 23A instead of the engine restart control unit 23 in the first embodiment described above.
　エンジン再始動制御部２３Ａは、エンジン停止制御部２２によりエンジン３からの駆動力の出力を停止させた後、シートスイッチ１８により運転席２１への運転者の着席が検出されると共にニュートラルスイッチ１９によりディレクションレバー１６がニュートラル位置にあることが検出されると、インジェクタ１７からの燃料の噴射を再開させるように制御用ソレノイド１７ａを制御する。 After the engine stop control unit 22 stops the output of the driving force from the engine 3, the engine restart control unit 23A detects that the driver is seated in the driver's seat 21 by the seat switch 18 and the neutral switch 19. When it is detected that the direction lever 16 is in the neutral position, the control solenoid 17a is controlled so as to restart the injection of fuel from the injector 17.
　また、エンジン再始動制御部２３Ａは、シートスイッチ１８により運転席２１への運転者の着席が検出されると共にニュートラルスイッチ１９によりディレクションレバー１６がニュートラル以外の位置にあることが検出されたときは、警告を行う。 Further, when the seat switch 18 detects that the driver is seated in the driver's seat 21 and the neutral switch 19 detects that the direction lever 16 is in a position other than the neutral position, the engine restart control unit 23A detects that the driver is seated in the driver's seat 21. Give a warning.
　図６は、エンジン再始動制御部２３Ａにより実行されるエンジン再始動制御処理手順の詳細を示すフローチャートである。図６は、図４に対応する図である。 FIG. 6 is a flowchart showing details of the engine restart control processing procedure executed by the engine restart control unit 23A. FIG. 6 is a diagram corresponding to FIG.
　図６において、エンジン再始動制御部２３Ａは、上記の第１実施形態におけるエンジン再始動制御部２３と同様に、手順Ｓ１１１～Ｓ１１３を順次実行する。エンジン再始動制御部２３Ａは、手順Ｓ１１２でディレクションレバー１６がニュートラル位置にないと判断したときは、警告器３０により警告を行うように警告器３０を制御する（手順Ｓ１２０）。 In FIG. 6, the engine restart control unit 23A sequentially executes the procedures S111 to S113 in the same manner as the engine restart control unit 23 in the first embodiment described above. When the engine restart control unit 23A determines in step S112 that the direction lever 16 is not in the neutral position, the engine restart control unit 23A controls the warning device 30 so as to give a warning by the warning device 30 (procedure S120).
　エンジン再始動制御部２３Ａは、手順Ｓ１１１で運転者が運転席２１に着席していないと判断したとき、または手順Ｓ１２０を実行した後、インジェクタ１７を閉じるように制御用ソレノイド１７ａを制御する（手順Ｓ１１４）。 The engine restart control unit 23A controls the control solenoid 17a so as to close the injector 17 when it is determined in step S111 that the driver is not seated in the driver's seat 21 or after executing step S120 (procedure). S114).
　このように本実施形態においては、エンジン３からの駆動力の出力が停止した後、運転者が運転席２１に着席したときに、ディレクションレバー１６がニュートラル以外の位置にある場合には、警告が行われることになる。従って、エンジン３からの駆動力の出力が停止した状態が継続していることを運転者に通知することができる。この場合には、運転者がディレクションレバー１６をニュートラル位置に切換操作することで、エンジン３からの駆動力の出力を再開させることが可能となる。 As described above, in the present embodiment, when the driver is seated in the driver's seat 21 after the output of the driving force from the engine 3 is stopped, if the direction lever 16 is in a position other than the neutral position, a warning is issued. It will be done. Therefore, it is possible to notify the driver that the state in which the output of the driving force from the engine 3 is stopped continues. In this case, the driver can restart the output of the driving force from the engine 3 by switching the direction lever 16 to the neutral position.
　図７は、本発明の第３実施形態に係るエンジン制御装置の制御系の構成を示すブロック図である。図７は、図２に対応する図である。図７において、本実施形態のエンジン制御装置１は、インジェクタ１７の制御用ソレノイド１７ａとフォークリフト２に搭載されたバッテリ４０との間に配置されたリレー４１を備えている。 FIG. 7 is a block diagram showing a configuration of a control system of the engine control device according to the third embodiment of the present invention. FIG. 7 is a diagram corresponding to FIG. In FIG. 7, the engine control device 1 of the present embodiment includes a relay 41 arranged between the control solenoid 17a of the injector 17 and the battery 40 mounted on the forklift 2.
　リレー４１としては、１次側に電流を流すと、２次側が開くｂ接点リレーが使用される。リレー４１は、車両制御コントローラ２０からの制御信号に応じて開閉状態が切り換えられる。具体的は、車両制御コントローラ２０からリレー４１にＯＦＦ信号が出力されると、リレー４１が閉状態となり、バッテリ４０と制御用ソレノイド１７ａとが導通する。車両制御コントローラ２０からリレー４１にＯＮ信号が出力されると、リレー４１が開状態となり、バッテリ４０と制御用ソレノイド１７ａとの導通が遮断される。 As the relay 41, a b-contact relay that opens the secondary side when a current is passed through the primary side is used. The open / closed state of the relay 41 is switched according to the control signal from the vehicle control controller 20. Specifically, when an OFF signal is output from the vehicle control controller 20 to the relay 41, the relay 41 is closed and the battery 40 and the control solenoid 17a are electrically connected. When the ON signal is output from the vehicle control controller 20 to the relay 41, the relay 41 is opened and the continuity between the battery 40 and the control solenoid 17a is cut off.
　エンジン制御装置１の車両制御コントローラ２０は、上記の第１実施形態と同様に、エンジン停止制御部２２と、エンジン再始動制御部２３とを有している。 The vehicle control controller 20 of the engine control device 1 has an engine stop control unit 22 and an engine restart control unit 23, as in the first embodiment described above.
　エンジン停止制御部２２は、ディレクションレバー１６がニュートラル以外の位置にあると判断すると共に、運転席２１からの運転者の離席状態が規定時間継続していると判断したときは、インジェクタ１７を閉じるようにリレー４１を制御する（図３の手順Ｓ１０１～Ｓ１０３参照）。言い換えれば、エンジン停止制御部２２は、シートスイッチ１８により運転席２１からの運転者の離席が検出されると、エンジン３への燃料の供給を停止させるようにリレー４１を介してインジェクタ１７を制御する。 When the engine stop control unit 22 determines that the direction lever 16 is in a position other than neutral and determines that the driver has been away from the driver's seat 21 for a specified time, the engine stop control unit 22 closes the injector 17. The relay 41 is controlled in this manner (see procedures S101 to S103 in FIG. 3). In other words, when the seat switch 18 detects that the driver has left the driver's seat 21, the engine stop control unit 22 sends the injector 17 via the relay 41 so as to stop the supply of fuel to the engine 3. Control.
　このとき、エンジン停止制御部２２からリレー４１に、制御信号としてＯＮ信号が出力される。従って、リレー４１が開状態となるため、インジェクタ１７の制御用ソレノイド１７ａがＯＦＦ状態（非通電状態）となる。これにより、インジェクタ１７が閉弁するため、インジェクタ１７からの燃料の噴射が停止する。 At this time, an ON signal is output from the engine stop control unit 22 to the relay 41 as a control signal. Therefore, since the relay 41 is in the open state, the control solenoid 17a of the injector 17 is in the OFF state (non-energized state). As a result, the injector 17 is closed, so that the injection of fuel from the injector 17 is stopped.
　エンジン再始動制御部２３は、運転者が運転席２１に着席したと判断すると共に、ディレクションレバー１６がニュートラル位置にあると判断したときは、インジェクタ１７を開くようにリレー４１を制御する（図４の手順Ｓ１１１～Ｓ１１３参照）。言い換えれば、エンジン再始動制御部２３は、シートスイッチ１８により運転席２１への運転者の着席が検出されると共にニュートラルスイッチ１９によりディレクションレバー１６がニュートラル位置にあることが検出されると、エンジン３への燃料の供給を再開させるようにリレー４１を介してインジェクタ１７を制御する。 The engine restart control unit 23 controls the relay 41 so as to open the injector 17 when it is determined that the driver is seated in the driver's seat 21 and the direction lever 16 is in the neutral position (FIG. 4). (See steps S111 to S113). In other words, when the seat switch 18 detects that the driver is seated in the driver's seat 21 and the neutral switch 19 detects that the direction lever 16 is in the neutral position, the engine restart control unit 23 determines that the engine 3 The injector 17 is controlled via the relay 41 so as to restart the supply of fuel to the engine.
　このとき、エンジン再始動制御部２３からリレー４１に、制御信号としてＯＦＦ信号が出力される。従って、リレー４１が閉状態（図７の状態）となるため、インジェクタ１７の制御用ソレノイド１７ａがＯＮ状態（通電状態）となる。これにより、インジェクタ１７が開弁するため、インジェクタ１７からの燃料の噴射が再開する。 At this time, an OFF signal is output from the engine restart control unit 23 to the relay 41 as a control signal. Therefore, since the relay 41 is in the closed state (state in FIG. 7), the control solenoid 17a of the injector 17 is in the ON state (energized state). As a result, the injector 17 opens, so that fuel injection from the injector 17 is restarted.
　このように本実施形態においては、車両制御コントローラ２０が故障したときでも、リレー４１が開状態となり、インジェクタ１７の制御用ソレノイド１７ａが通電状態となるため、インジェクタ１７によるエンジン３への燃料の供給を行うことが可能となる。この場合には、エンジン３の停止が抑制されるため、フォークリフト２を安全な場所へ退避走行させることができる。 As described above, in the present embodiment, even when the vehicle control controller 20 fails, the relay 41 is opened and the control solenoid 17a of the injector 17 is energized, so that the injector 17 supplies fuel to the engine 3. Can be done. In this case, since the stop of the engine 3 is suppressed, the forklift 2 can be evacuated to a safe place.
　なお、本発明は、上記実施形態には限定されない。例えば上記実施形態では、フォークリフト２の走行時に、運転席２１からの運転者の離席が検出されると、エンジン３からの駆動力の出力が停止しているが、フォークリフト２の走行が停止中でも、運転席２１からの運転者の離席が検出されると、エンジン３からの駆動力の出力が停止する。 The present invention is not limited to the above embodiment. For example, in the above embodiment, when the driver's departure from the driver's seat 21 is detected while the forklift 2 is traveling, the output of the driving force from the engine 3 is stopped, but the forklift 2 is also stopped. When the driver's departure from the driver's seat 21 is detected, the output of the driving force from the engine 3 is stopped.
　また、上記実施形態では、運転席２１からの運転者の離席状態が規定時間継続していることが検出されたときに、インジェクタ１７が閉じるように制御されているが、特にその形態には限られず、運転席２１からの運転者の離席が検出された時点で、インジェクタ１７を閉じるように制御してもよい。 Further, in the above embodiment, the injector 17 is controlled to close when it is detected that the driver has been away from the driver's seat 21 for a predetermined time. The injector 17 may be controlled to be closed when the driver's departure from the driver's seat 21 is detected.
　また、上記実施形態では、ディレクションレバー１６がニュートラル以外の位置にある状態で、運転席２１からの運転者の離席状態が規定時間継続していることが検出されたときに、インジェクタ１７が閉じるように制御されているが、特にその形態には限られず、ディレクションレバー１６がニュートラル位置にある状態でも、運転席２１からの運転者の離席が検出されたときは、インジェクタ１７を閉じるように制御してもよい。 Further, in the above embodiment, the injector 17 closes when it is detected that the driver has been away from the driver's seat 21 for a predetermined time while the direction lever 16 is in a position other than the neutral position. However, the form is not particularly limited, and even when the direction lever 16 is in the neutral position, the injector 17 is closed when the driver's departure from the driver's seat 21 is detected. You may control it.
　また、上記実施形態では、インジェクタ１７を制御することにより、エンジン３からの駆動力の出力を停止または再開させているが、特にその形態には限られず、例えばエンジン３において燃料と空気との混合気に点火する点火プラグを制御したり、エンジン３への吸入空気量を調整するスロットルバルブを制御することにより、エンジン３からの駆動力の出力を停止または再開させてもよい。 Further, in the above embodiment, the output of the driving force from the engine 3 is stopped or restarted by controlling the injector 17, but the present embodiment is not particularly limited, and for example, in the engine 3, a mixture of fuel and air is used. The output of the driving force from the engine 3 may be stopped or restarted by controlling the spark plug that ignites the air or controlling the throttle valve that adjusts the amount of intake air to the engine 3.
　また、上記実施形態のエンジン制御装置１は、フォークリフト２に搭載されているが、本発明は、パワーステアリング用アクチュエータを備えていれば、例えばトーイングトラクタ等の産業車両にも適用可能である。 Further, although the engine control device 1 of the above embodiment is mounted on the forklift 2, the present invention can be applied to an industrial vehicle such as a towing tractor as long as it is provided with an actuator for power steering.
　１　　エンジン制御装置
　２　　フォークリフト（産業車両）
　３　　エンジン
　１０　　油圧ポンプ
　１１　　パワーステアリングシリンダ（パワーステアリング用アクチュエータ）
　１６　　ディレクションレバー（ディレクション操作具）
　１７　　インジェクタ（燃料供給部）
　１８　　シートスイッチ（離着席検出部）
　１９　　ニュートラルスイッチ（ニュートラル検出部）
　２１　　運転席
　２２　　エンジン停止制御部（第１制御部）
　２３，２３Ａ　　エンジン再始動制御部（第２制御部）
　３０　　警告器
　４０　　バッテリ
　４１　　リレー 1 Engine control device 2 Forklift (industrial vehicle)
3 Engine 10 Hydraulic pump 11 Power steering cylinder (actuator for power steering)
16 Direction lever (direction operation tool)
17 Injector (fuel supply section)
18 Seat switch (separation / seat detection unit)
19 Neutral switch (neutral detector)
21 Driver's seat 22 Engine stop control unit (1st control unit)
23,23A Engine restart control unit (second control unit)
30 Warning device 40 Battery 41 Relay

Claims (5)

  1. 　エンジンにより駆動される油圧ポンプからの作動油によってパワーステアリング用アクチュエータが動作する産業車両のエンジン制御装置であって、
    　前記産業車両の運転席に対する運転者の離着席状態を検出する離着席検出部と、
    　前記産業車両のディレクション操作具がニュートラル位置にあるかどうかを検出するニュートラル検出部と、
    　前記離着席検出部により前記運転席からの運転者の離席が検出されると、前記エンジンからの駆動力の出力を停止させる第１制御部と、
    　前記第１制御部により前記エンジンからの駆動力の出力を停止させた後、前記離着席検出部により前記運転席への運転者の着席が検出されると共に前記ニュートラル検出部により前記ディレクション操作具が前記ニュートラル位置にあることが検出されると、前記エンジンからの駆動力の出力を再開させる第２制御部とを備える産業車両のエンジン制御装置。     An engine control device for an industrial vehicle in which a power steering actuator is operated by hydraulic oil from a hydraulic pump driven by an engine.
    The take-off / seat detection unit that detects the take-off / seat state of the driver with respect to the driver's seat of the industrial vehicle
    A neutral detection unit that detects whether or not the direction operating tool of the industrial vehicle is in the neutral position,
    When the driver's departure from the driver's seat is detected by the departure / arrival detection unit, the first control unit that stops the output of the driving force from the engine, and the first control unit.
    After the output of the driving force from the engine is stopped by the first control unit, the driver's seating in the driver's seat is detected by the take-off and seat detection unit, and the direction operating tool is activated by the neutral detection unit. An engine control device for an industrial vehicle including a second control unit that restarts the output of driving force from the engine when it is detected to be in the neutral position.
  2. 　前記エンジンに燃料を供給する燃料供給部を更に備え、
    　前記第１制御部は、前記離着席検出部により前記運転席からの運転者の離席が検出されると、前記エンジンへの燃料の供給を停止させるように前記燃料供給部を制御し、
    　前記第２制御部は、前記離着席検出部により前記運転席への運転者の着席が検出されると共に前記ニュートラル検出部により前記ディレクション操作具が前記ニュートラル位置にあることが検出されると、前記エンジンへの燃料の供給を再開させるように前記燃料供給部を制御する請求項１記載の産業車両のエンジン制御装置。     Further provided with a fuel supply unit for supplying fuel to the engine,
    The first control unit controls the fuel supply unit so as to stop the supply of fuel to the engine when the driver's departure from the driver's seat is detected by the departure / arrival detection unit.
    When the second control unit detects that the driver is seated in the driver's seat by the takeoff / seating detection unit and the neutral detection unit detects that the direction operating tool is in the neutral position, the second control unit said. The engine control device for an industrial vehicle according to claim 1, wherein the fuel supply unit is controlled so as to restart the supply of fuel to the engine.
  3. 　前記燃料供給部とバッテリとの間に配置されたリレーを更に備え、
    　前記第１制御部は、前記離着席検出部により前記運転席からの運転者の離席が検出されると、前記エンジンへの燃料の供給を停止させるように前記リレーを介して前記燃料供給部を制御し、
    　前記第２制御部は、前記離着席検出部により前記運転席への運転者の着席が検出されると共に前記ニュートラル検出部により前記ディレクション操作具が前記ニュートラル位置にあることが検出されると、前記エンジンへの燃料の供給を再開させるように前記リレーを介して前記燃料供給部を制御する請求項２記載の産業車両のエンジン制御装置。     Further equipped with a relay arranged between the fuel supply unit and the battery,
    When the driver's departure from the driver's seat is detected by the departure / arrival detection unit, the first control unit has the fuel supply unit via the relay so as to stop the supply of fuel to the engine. Control and
    When the second control unit detects that the driver is seated in the driver's seat by the takeoff / seating detection unit and the neutral detection unit detects that the direction operating tool is in the neutral position, the second control unit said. The engine control device for an industrial vehicle according to claim 2, wherein the fuel supply unit is controlled via the relay so as to restart the supply of fuel to the engine.
  4. 　前記第１制御部は、前記離着席検出部により前記運転席からの運転者の離席状態が規定時間継続したことが検出されると、前記エンジンからの駆動力の出力を停止させる請求項１～３の何れか一項記載の産業車両のエンジン制御装置。 The first control unit stops the output of the driving force from the engine when the departure / arrival detection unit detects that the driver has been away from the driver's seat for a predetermined time. The engine control device for an industrial vehicle according to any one of 3 to 3.
  5. 　前記第２制御部は、前記離着席検出部により前記運転席への運転者の着席が検出されると共に前記ニュートラル検出部により前記ディレクション操作具が前記ニュートラル以外の位置にあることが検出されたときは、警告を行う請求項１～４の何れか一項記載の産業車両のエンジン制御装置。 In the second control unit, when the driver's seating in the driver's seat is detected by the takeoff / seating detection unit and the neutral detection unit detects that the direction operating tool is in a position other than the neutral position. Is an engine control device for an industrial vehicle according to any one of claims 1 to 4, which gives a warning.
PCT/JP2020/031909 2019-09-04 2020-08-25 Engine control device for industrial vehicle WO2021044892A1 (en)

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